Blade attachment for drag scrapers



y 1954 T. c. WHISLER 2,683,942

BLADE ATTACHMENT FOR DRAG SCRAPERS Original Filed July 21, 1947 3 Sheets-Sheet l y 1954 T. c. WHISLER BLADE ATTACHMENT FOR DRAG SCRAPERS 3 Sheets-Sheet 2 Original Filed July 21, 1947 July 20, 1954 c w s 2,683,942

Y BLADE ATTACHMENT FOR DRAG SCRAPERS Original Filed July 21, 1947 3 Sheets-Sheet I5 Patented July 20, 1954 UNITED STATES ihhTENT QFFICE BLADE ATTACHMENT FOR DRAG SCRAPERS Original application July 21, 1947, Serial No. 762,305. Divided and this application April 6, 1949, Serial No. 85,911

Claims. 1

The invention relates to a drag scraper and has reference more particularly to a drag scraper of improved design which will be rugged and durable in construction although consisting of relatively few parts that can be economically manufactured.

An object of the invention is to provide a dra scraper essentially comprising a one-piece body member which will have a scrapin blade or lip portion releasably secured thereto by fastening bolts having connection with the rear surface of the body member, and wherein the fastening bolts and the nuts secured thereto are partially housed by special structure formed integral. with the body member on the rear thereof so that the bolts are protected against damage during backward travel of the scraper.

Another object resides in the provision of a drag scraper having a taper fit between the body member and blade portion whereby the weight of the scraper acts to tighten the fit between the parts. As regards this structural feature of the present scraper it may be pointed out that the fastening bolts for securing the blade portion to the body member are disposed substantially parallel to the center line of the taper fit between the parts so that upon tightening the bolts the tension is applied directly to tighten the taper fit.

With these and various other objects in view, the invention may consist of certain novel features of construction and operation, as will be more fully described and particularly pointed out in the specification, drawings and claims appended hereto.

In the drawings which illustrate an embodiment of the device and wherein like reference characters are used to designate like parts- Figure 1 is a perspective view illustrating a drag scraper constructed in accordance with the invention;

Figure 2 is a perspective view showing the improved scraper of Figure 1 with one arm and one side wall removed;

Figure 3 is a side elevational view of the drag scraper of the invention;

Figure 4 is a rear view illustrating certain improved structural features formed on the rear Wall of the body member;

Figure 5 is a fragmentary sectional view taken longitudinally of the scraper substantially along the center line thereof;

Figure 6 is a fragmentary sectional view showin details incorporated in the construction of the body member; and

Figure '7 is a sectional view taken transversely 2 of the blade or lip portion or the scraper showing structural details thereof.

The drag scraper selected for illustratin the present invention is disclosed in the drawings as including a body member 2a of one-piece construction substantially circular in plan, having a pair of arms 2i and 22 and a scraper blade or lip portion 23 releasably secured thereto. The side wall members 2t and 2% have interfitting relation with the arms and the body member, being releasably secured to both of these parts.

As best shown in Figures 1, 2 and 3, the body member includes a top wall 28, a pair of side walls 27 and 28 and a back wall to of curved formation. In accordance with the invention the side walls 2! and 2B of the body member are provided with recesses of channel shape formed integrally with the body member. Recess 3i receives the arm 2i, whereas recess 32 receives the arm 22. It will be seen that each recess extends to the rear of the body member, since the arms are bent for engaging the rear wall of said member, and each recess has a top and a bottom surface which taper outwardly so that the base of the channel is of less height than the opening. A plurality of bolt openings 53 are formed in each side Wall of the body member in aligmnent with the channelshaped recess for receiving securing bolts by means of which the arms are secured to the body member as will be hereinafter described.

Whereas the curved bacl: wall to of the body member is smooth and unobstructed throughout its inside surface, the rear surface of said back wall is provided with a horizontal reinforcing rib 34 and a plurality of vertical ribs 35 and 36 connecting with horizontal rib 3d. The ribs 35 are spaced to form pairs which are joined by the wall portion 3? providing a substantially tubular formation on the rear of the body member for receiving and protecting securing bolts for the scraping blade 23 as Will be presently described in detail. The vertical ribs 36 are apertured at 38 for receiving cables or the like whereby to effect rearward travel of the drag scraper. If found desirable the rear of the scraper may be protected by means of the bumper or rear guard til substantially semi-circular in plan, as shown in Figure l, and which is suitably welded as at ll to the side walls 2i and 25: of the body member.

The arms, adapted to have releasable securement to the body member by means of the channel-shaped recesses 3i and 32 provided therefor, are probably best illustrated in the perspective views, Figures 1 and 2. Each arm is channelshaped in cross section and the top and, bottom surfaces thereof taper so as to fit the tapering formation of the channel-shaped recesses whereby the maximum rigidity is obtained between the parts when the arms are bolted to the body memher. For this purpose the bolts 42 are provided which extend through openings 33 in the body member and through openings in the respective arms. The heads of the bolts are square and the inside surface of the body member are provided with square socket openings M for receiving said square heads. The securing nuts 45 are threaded to the projecting end of the bolts, having location within the channels of the arms, and by tightening said nuts the parts are securely united as described. It will be observed that each arm is provided with an integral lug 38 having a right angle relation with its adjacent portion of the arm and which lug is adapted to extend around the rear of the body member, as shown in Figure 4, whereby such interfitting relation of the arms with the body member act to relieve the securing bolts of excessive stresses and strains. The lug it of each arm is provided with an opening adapted to receive a securing bolt such as at which passes through the rear wall of the body member and through said lug for additionally securing each arm to the body mem her. At their forward end the arms have a special formation by means of which they have interlocking relation for rigidly securing the arms together.

The blade portion 23 of the drag scraper is substantially rectangular in shape, as is clearly evident by reference to Figure 2. The bottom surface it is bevelled to form a scraping edge and the top edge of the blade portion is formed with a tapering recess '54 providing the bifurcated wall sections i and is. The front wall section 25 has formed integral therewith a plurality of extensions !i, three being shown in the illustrated embodiment, and each extension includes the depending end l8 having a right angle relation with its extension. Each depending end is slotted at E9. The rear wall 36} of the body member has a bottom edge 86, as best shown in Figure 5, which tapers in a direction downwardly for interfitting relation with the recess 14. At spaced locations along its bottom edge 88 the rear wall 38 is slotted to form the openings 81, three of these slotted openings being provided, and it will be observed that the same are located so as to align with the extensions ll when the blade portion is properly associated with the body member. The slots 8! have a top terminal edge formed by the wall 82, which wall joins the curved wall with wall portion 3?. Said wall 32 may be considered as the bottom of its respective tubular formation located on the rear of the back wall as previously described and which comprises a pair of ribs 35 and the wall portion 31.

Upon assemblin the blade portion 23 with the back wall 3i) of the scraper the bottom edge 86 will have location in the tapering recess '14 and the extensions 'ii' will align with the slots 8!. As a result of this interfitting relation of the parts and depending end 78 of each extension is located adjacent and substantially parallel with its respective wall 252. Also the slot 19 in each depending end Til is aligned with a bolt receiving opening 83 in wall 82 and for securing the blade portion to the body member each slot 79 retains the head of a bolt Figure 5, which extends through its aligned opening 83 to project into the tubular formation provided therefor. The

bolts receive the threaded nuts for securin the same in place.

An important feature of the invention resides in the location of the securing bolts 84 substantially on the center line of the taper fit between the blade portion and the body member. As a result the action of tightening the bolts 84 is applied directly to the blade portion and in a manner to tighten the taper fit in direct proportion to the tightening action of the bolts. The structure has been designed for ready accessibility to the tightening nuts 85 although the same are protected from damage by means of the surrounding tubular formation. Removability of the blade portion is materially facilitated by said structure since the blade portion can be removed and another one applied to the body member merely by manipulation of the nuts 85 on the securing bolts 3d. With the blade portion securely bolted in assembled relation to the body member it will be seen that the extensions 71 have a slight curvature which forms a continuation of the curved inner surface of the rear wall as.

Each side wall member 2 and 25 has releasable securement to the body member and to its respective arm. For this purpose each member has a special formation which may be described as double bend. For example, referring to side wall member 225, as shown in Figure 2, it will be observed that the member has an intermediate horizontal portion at located in contact with the underside of the arm 22 and said portion is extended on the inside of the arm providin the interior flange 88. Said flange 88 and the hori- Zontal portion 8? of the side member 25 therefor have contact with the inside wall and the bottom wall of its arm 22. The flange 88 is directly secured to the arm 22 by bolts 88 which receive the threaded nuts 9%. The heads of said bolts 98 are square, similar in all respects to bolts 42, and the flange 88 is formed with bosses having square openings for receiving the heads. The side wall member 25 is additionally secured to the body member by means of bolts 92 which extend through from the inside and receive the securing nuts 93. Here also the bolts 92 have square heads which are received by square openings located in bosses formed on the inside wall of the body member.

The formation of the side wall member 24 is similar to that of member 25, the same having an intermediate horizontal portion 81 and an inside ilange 88. Bolts fill are provided for securing the flange to arm 2! and bolts 92 are also employed for securing the side wall member to the body member exactly as described with respect to side Wall 25.

This application is a divisional application of my copending application Serial No. 762,305, filed July 21, 1947, now Patent No. 2,626,471 and entitled Scraper Bucket.

The nvention is not to be limited to or by details of construction of the particular embodiment thereof illustrated by the drawings as various forms of the device will of course be apparent to those skilled in the art without departing from the spirit of the invention or the scope of the claims.

What is claimed is:

1. In a drag scraper, in combination, a body member having side walls and a forwardly concave back wall, a marginal portion of said back Wall being wedge-shaped in transverse cross section and said back wall having a plurality of slotted openings spaced along the length of the marginal portion, each slotted opening having a top and a back wall portion, a blade member provided with a wedge-shaped groove along the top edge thereof for receiving the wedge-shaped marginal portion of the back wall, said blade member having a plurality of extensions along the grooved top edge aligning with and adapted to enter the slotted openings respectively in assembling the blade member on the back wall, and means releasably securing the blade member to the back wall in assembled relation, said means including a securing bolt for each slotted opening disposed substantially parallel to the center line of the taper fit between the parts and having contact with the extension in the opening and with the respective top wall portion.

2. A drag scraper as defined by claim 1, additionally including a plurality of formations on the rear of the back well, each formation being formed in part by the back wall portion of its respective slotted opening and providing means for receiving and protecting the head of the securing bolt for that slotted opening.

3. In a drag scraper, in combination, a body member having side walls and a forwardly concave back wall, the bottom edge of said back wall being wedge-shaped in transverse cross section and said back wall having a plurality of slotted openings spaced along the length of the said bottom edge, each slotted opening having a top and a back wall portion integral with the said back wall, a blade member provided with a wedge-shaped groove along the top edge thereof for receiving the wedge-shaped bottom edge of the back wall, said blade member having a plurality of extensions along the grooved top edge aligning with and adapted to enter the slotted openings respectively in assembling the blade member on the back wall, and securing bolts for releasably securing the blade member to the back wall in assembled relation, a securing bolt for each slotted opening disposed substantially on the center line of the taper fit between the parts and having contact with the extension in the opening and with the respective top wall portion.

4. In a drag scraper, in combination, a body member including a back wall adapted to have a blade member releasably secured to the bottom edge thereof, said bottom edge of the back wall being wedge-shaped in transverse cross section and said back wall having a plurality of slotted openings spaced along the length of the bottom edge, a top wall defining the top edge of each opening and extending rearwardly of the back wall, a blade member provided with a wedge-shaped groove along the top edge thereof for receiving the wedge-shaped bottom edge of the back wall when the parts are assembled in operative relation, a plurality of extensions provided by the blade member along the top edge thereof adapted to align with and enter the slotted openings respectively, and securing bolts for releasably securing the blade member to the back wall in assembled relation, the securing bolt for each slotted opening being disposed substantially on the center line of the taper fit between the parts and having contact with the extension in that opening and with the top wall of the opening.

5. A drag scraper as defined by claim 4, additionally including an ear formed on each extension at the top edge thereof and projecting rearwardly in a direction parallel with its respective top wall, and wherein the securing bolt for the particular slotted opening has contact with the top wall thereof and with the ear on the extension located in the opening.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date 866,971 Sherwood Sept. 24, 1907 1,417,183 Lawton May 23, 1922 1,642,191 Bager et al Sept. 13, 1927 2,390,611 Nixon Dec. 11, 1945 2,482,320 Clemmer Sept. 20, 1949 

